While fuel economy is naturally a primary benefit, the real beauty of the Trail-Eze II wind deflector is its unique automatic tilting feature. Spring loaded struts push the deflector to a near vertical angle for sharp turns at low speeds while natural wind pressure tilts it back for maximum slipstream angle at high speeds. Plus it reduces wind shear and bug splatter on your trailer. It's made of strong, lightweight fiberglass and installs in minutes. There are no holes to drill because it attaches to the forward bed stake pockets and not the roof itself. It easily fits most full sized pickups and when not in towing mode can be lowered to full horizontal position in just seconds.